Abstract
Abstract Al3Ti/ADC12 composite was synthesized in situ using Al-fluoride potassium titanate (K2TiF6) as the reaction system and an ultrasonic assisted direct melt reaction. Results indicate ultrasonic chemistry reactions are both accelerated and more complete compared to traditional in situ reactions. Al3Ti reinforced particles with a regular shape and size of 1-2 μm were well distributed and as-cast microstructures of composites were superior. Composite particles under ultrasonic assistance were also refined to a greater extent. Tensile strength and elongation rate of the composites reached 255 MPa and 2.2%, an increase of 19.1% and 37.5% respectively to those without ultrasonic aid. Cleavage surface of the composite declined and the number of dimples increased while dimples became smaller and deeper, showing obvious ductile fracture.
Highlights
ADC12 is a die casting alloy widely used in automotive and aerospace industries
Al3Ti/ADC12 composite was synthesized in situ using Al-fluoride potassium titanate (K2TiF6) as the reaction system and an ultrasonic assisted direct melt reaction
Particle morphology and size were small with an average approximating to 1~2 μm and Al3Ti was dispersed in the matrix alloy
Summary
ADC12 is a die casting alloy widely used in automotive and aerospace industries. Augmenting the long, needlelike and coarse microstructure of ADC12 alloy morphologies is a principal objective as this will expand its application. The in situ synthesis reaction method is the predominant way to prepare particulate reinforced metal matrix composites. The most effective way to combine casting and ultrasonic technology to prepare composites has become a popular research topic. Sreekumar et al [15] have successfully manufactured Al–MgAl2O4 metal matrix composite using the in situ synthesis reaction method with ultrasonication. Patel et al [16] reported on Al5083-TiC composites synthesized in situ using a self propagating high temperature synthesis process casting route with and without ultrasonic treatment. Nano ZrB2 particle reinforced 2024Al matrix composites synthesized from 2024Al–K2ZrF6–KBF4 system by direct melt reaction were studied by Kai et al [17]. It was demonstrated that highintensity ultrasonic treatment could improve the nanoparticle uniformity and result in enhanced mechanical properties. 1. temperature control instrument 2. amplitude transformer 3. crucible 4. thermocouple 5. mobile platform 6. ultrasonic generator 7. resistance furnace 8. ultrasonic controller 9. cooling plate
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